This work was carried out in order to observe the results in association vesicular arbuscular mycorrhizae formed by Gigasporamargarita Becker & Hall in seedling of coffee inoculate with Rhizoctonia solani Kuhn in fumigated substrate and not fumigatedsubstrate with distinct dosages of superfosphate simples. Two effecs tests were made with distinct dosages of superphosphate simples, the first one was made with 1 kg/m3 and another one with 4 kg/m3. The seedlings of coffee developed in masonry germination with grit by substrate until the probation of "match". Later uniformed and transplanted to plastic recipients concurrent by inoculation mycorrhized fungi was realized the inoculation, of R. solani 60 days after the transplantig when more than 80% ofplants haw already showed the first couple of leaves. The avaliation was realized six months after the transplanting of the seedling. Height, freschweigh, dry weigh, of roots and air part, percentage of root colonization and reaction of host by R. solani was considerated. By the results observaded in the first effect test, the seedling. Althoug of the colonized by a meduim rate 32,22% did not show statistic different in no one caracteristics studied however lowers heights, dry weight on fresch of root end air plant of the plants no mycorrhized and inoculed with R. solani in fumigated substrate. The analyses showed the Rhizoctonia solani reduced meaningfuly the index of survival of the seedling of coffee in all the testes. By resultes observated in the second effect test showed bigger development of the seedling mycorrhized that overcome the not mycorrhized in presence of patogen.